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Article 如何控制2线风扇的速度？

2 线或3 线风扇没有专用的速度控制输入，这些风扇的速度必须通过改变作用在风扇上的电压进行调整。下图所示PWM控制架构可以提供较高的效率：



PWM信号频率为30Hz左右。

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